import shallowEqual from '../../src/utils/shallowEqual'

describe('Utils', () => {
  describe('shallowEqual', () => {
    it('should return true if arguments fields are equal', () => {
      expect(
        shallowEqual({ a: 1, b: 2, c: undefined }, { a: 1, b: 2, c: undefined })
      ).toBe(true)

      expect(shallowEqual({ a: 1, b: 2, c: 3 }, { a: 1, b: 2, c: 3 })).toBe(
        true
      )

      const o = {}
      expect(shallowEqual({ a: 1, b: 2, c: o }, { a: 1, b: 2, c: o })).toBe(
        true
      )

      const d = function() {
        return 1
      }
      expect(
        shallowEqual({ a: 1, b: 2, c: o, d }, { a: 1, b: 2, c: o, d })
      ).toBe(true)
    })

    it('should return false if arguments fields are different function identities', () => {
      expect(
        shallowEqual(
          {
            a: 1,
            b: 2,
            d: function() {
              return 1
            }
          },
          {
            a: 1,
            b: 2,
            d: function() {
              return 1
            }
          }
        )
      ).toBe(false)
    })

    it('should return false if first argument has too many keys', () => {
      expect(shallowEqual({ a: 1, b: 2, c: 3 }, { a: 1, b: 2 })).toBe(false)
    })

    it('should return false if second argument has too many keys', () => {
      expect(shallowEqual({ a: 1, b: 2 }, { a: 1, b: 2, c: 3 })).toBe(false)
    })

    it('should return false if arguments have different keys', () => {
      expect(
        shallowEqual(
          { a: 1, b: 2, c: undefined },
          { a: 1, bb: 2, c: undefined }
        )
      ).toBe(false)
    })

    it('should compare two NaN values', () => {
      expect(shallowEqual(NaN, NaN)).toBe(true)
    })

    it('should compare empty objects, with false', () => {
      expect(shallowEqual({}, false)).toBe(false)
      expect(shallowEqual(false, {})).toBe(false)
      expect(shallowEqual([], false)).toBe(false)
      expect(shallowEqual(false, [])).toBe(false)
    })

    it('should compare two zero values', () => {
      expect(shallowEqual(0, 0)).toBe(true)
    })
  })
})
